One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,16,15)(11,12,18,14)(13,21,24,17)(19,23,22,20)(26,31)(28,32)(33,39)(36,40)(1,2)(3,8)(4,6)(5,7)(9,11)(10,14)(12,15)(13,22)(16,18)(17,20)(19,24)(21,23)(26,31)(27,34)(33,39)(35,37) involution — undirected(1,3,5,4)(2,6,7,8)(9,12,16,14)(10,11,15,18)(13,20,24,23)(17,19,21,22)(25,26,30,31)(27,32,34,28)(29,33,38,39)(35,40,37,36)(1,2)(3,6)(4,8)(5,7)(9,13,16,24)(10,17,15,21)(11,19,18,22)(12,20,14,23)(25,27)(26,32)(28,31)(29,37)(30,34)(33,36)(35,38)(39,40)(9,14,16,12)(10,18,15,11)(13,23,24,20)(17,22,21,19)(25,28,30,32)(26,27,31,34)(29,36,38,40)(33,35,39,37)(1,4,5,3)(2,6,7,8)(9,15,16,10)(11,12,18,14)(13,17,24,21)(19,23,22,20)(25,29,30,38)(26,33,31,39)(27,35,34,37)(28,36,32,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.